fix(statusline): cut Windows subprocess-spawn overhead ~3.5x - #177
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fix(statusline): cut Windows subprocess-spawn overhead ~3.5x#177anjerkastanjer wants to merge 16 commits into
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buddy-status.sh took 23-29s to run in a real Windows invocation
(COLUMNS unset), regularly exceeding whatever timeout the host enforces
on a refreshInterval:1 statusline command and getting killed before it
ever produced output, silently freezing the display on stale content
indefinitely -- which looks like a random rendering bug rather than
what it is. `bun test statusline/` against the unmodified script
scores 1 pass / 32 fail on this machine (mostly 5000ms test timeouts);
this change gets that to 15 pass / 18 fail, with runtime down to
~7.5-8s.
Root causes, in order of impact:
- dwidth() spawned iconv|od|awk (three processes) per call, and
word-wrap called it once per word. Every ASCII codepoint is width 1
under char_width()'s own rules (no wide/CJK/fullwidth/box-drawing
range overlaps 0-127), so ASCII-only input -- the common case for
reaction text -- can skip straight to ${#1}. Same fast path added to
dwidth_profile(), used once per output line by ansi_truncate().
- Nine separate jq calls against status.json, five against
config.json, and two against the reaction file, each ~100-400ms here
(this environment's per-process-spawn cost is unusually high,
plausibly antivirus real-time scanning, but the fix helps regardless
of why). Batched each group into one jq call emitting a joined
array, split back out with `IFS=$'\x1f' read -r`.
- Two separate powershell.exe calls (width, then height), each a full
PowerShell host boot measured at ~0.5-1s alone, collapsed into one.
- The /proc + `ps`-based PTY-walk loop is Linux/macOS-only: there is no
/proc and no real tty devices on Windows, so it ran all 5 iterations
and failed every single time, burning time on a probe that could
never succeed there. Skipped outright on Windows (uname -s check).
No behavior change intended for the values these produce, only how
many processes get spawned to compute them.
Signed-off-by: Titus Driessen <tts.driessen@gmail.com>
fix(statusline): cut Windows subprocess-spawn overhead ~3.5x
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📝 WalkthroughWalkthroughThe statusline scripts add timeout handling, consolidate JSON reads, skip Unix PTY traversal on Windows, combine PowerShell dimension probes, and optimize width processing. The VHS Dockerfile changes version pinning for non-rendering CLI packages. ChangesStatusline optimizations
CI package pinning
Estimated code review effort: 4 (Complex) | ~45 minutes Merge Risk: 🟡 Moderate · up to The PR substantially reduces Windows statusline overhead, but the current implementation can prevent statusline rendering or mis-handle width limits when no profile is supplied, and malformed color configuration can unexpectedly revert to defaults. These bounded correctness issues should be fixed or explicitly accepted before merge. Suggested reviewers: Poem
🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
Full details: Docstring CoverageExplanation Docstring coverage is 46.15% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 13 functions across 2 files. (1 skipped: 1 unsupported.) ✨ Finishing Touches 💡 1🛠️ Fix failing CI checks 💡
🧪 Generate unit tests (beta)
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Inline comments:
In `@statusline/buddy-status.sh`:
- Around line 57-61: Use lossless framing for all batched JSON text fields
before assigning shell variables: update the status-field parsing around
IFS/read and jq, including achievement, so embedded newlines and U+001F cannot
truncate or shift values; also update the REACTION and TS parsing at
statusline/buddy-status.sh lines 357-359 to use the same framing, preserving
accurate timestamps for freshness checks.
- Line 265: Update the initialization around _ttl so an empty or invalid
reactionTTL only receives its own default and does not overwrite valid sibling
settings such as _bw, _bm, _wa, or _density. Preserve the existing per-field
validation behavior, including retaining valid values read from config.json.
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The real bug behind "the buddy sometimes just doesn't show up at all" turned out to be worse than slow: on one Windows machine, `jq.exe` calls (and, less often, `powershell.exe`) had been getting orphaned and left running forever, apparently because when the host kills a slow statusline invocation's parent bash via taskkill /T /F, MSYS -spawned grandchildren don't reliably get caught by that /T cascade. Found 197 such zombie jq processes, some over a day old, none using any CPU (genuinely stuck, not just slow), pinning system CPU near 100% and making every subsequent process spawn slower -- which made more ticks slow enough to get killed, which left more zombies. A self-reinforcing spiral, not a one-off glitch. Wrap every jq and powershell.exe call (in both buddy-status.sh and the substatus.sh it sources) in `timeout`, so each is self-terminating regardless of what happens to its parent process tree. This is the actual fix; the prior commit's speed work only made the underlying kills less frequent, it didn't stop a killed tick from leaking. Also: replace two `sed` calls used to split a PowerShell command's two-line stdout with plain parameter expansion -- spawning two more processes just to split two lines undercut the point of merging the PowerShell calls in the first place. Signed-off-by: Titus Driessen <tts.driessen@gmail.com>
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Inline comments:
In `@statusline/buddy-status.sh`:
- Line 72: Replace every unqualified timeout invocation with a portable timeout
helper or establish and install the required dependency. Apply this consistently
at statusline/buddy-status.sh lines 72, 91, 131, 244, 328, 374, and 401, and
statusline/substatus.sh lines 48 and 52; preserve each command’s existing
timeout behavior.
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Two real correctness issues in the batched jq reads, both from consolidating several jq calls into one and separating fields with an ASCII 0x1F join: - Text fields (name, stars, achievement, reaction) can legitimately contain an embedded newline once jq decodes a JSON \n escape back into a real newline character. `read` always stops at a newline regardless of IFS, so a multi-line value would truncate that field and shift every field after it out of alignment. Strip embedded newlines (and, defensively, any literal 0x1F, in case a value ever contained the separator itself) at the jq level with a small `clean` filter before joining. - The config.json batch had a blanket fallback that reset all five fields to their defaults whenever `_ttl` alone came back empty, which could discard otherwise-valid sibling values. Removed it: the per-field validation right below already defaults each field independently by simply not overwriting its pre-set default when a value is empty or invalid, which was already correct on its own. Verified: `bun test statusline/`, plus a manual end-to-end check with an isolated CODING_BUDDY_STATE_DIR/CODING_BUDDY_USER_ID fixture containing a genuinely multi-line reaction (valid JSON, `\n` escapes decoded by jq into real newlines) -- renders as a single clean bubble line instead of breaking the field split. Signed-off-by: Titus Driessen <tts.driessen@gmail.com>
fix(statusline): guard every subprocess call with timeout
CodeRabbit correctly flagged that `timeout` is a GNU coreutils command, not part of macOS's default BSD userland -- it only exists there via Homebrew coreutils, installed as `gtimeout` specifically so it doesn't collide with any system tool. The prior commit called the unqualified `timeout` directly, which would have made every jq/PowerShell call in this file fail outright on a stock macOS install (the exact platform the zombie-process fix didn't need to worry about, since that failure mode was Windows-specific), turning the buddy invisible there instead of just slow. Added `_bt`, a thin wrapper that detects `timeout` or `gtimeout` once at startup and uses whichever is present; if neither is, it runs the wrapped command directly rather than failing. This keeps the Windows zombie-process protection intact while degrading gracefully (no hang-guard, but no breakage either) on any platform without either binary -- which is exactly parity with this file's behavior before these fixes existed. Signed-off-by: Titus Driessen <tts.driessen@gmail.com>
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Inline comments:
In `@statusline/buddy-status.sh`:
- Around line 45-46: Update the timeout binary selection in the initialization
logic to accept only a GNU-compatible timeout, validating its --version output
before assigning _TIMEOUT_BIN; reject native Windows timeout.exe and then fall
back to gtimeout. Preserve the existing _bt invocation syntax and selection
order.
- Around line 296-298: Update the jq configuration extraction feeding read to
sanitize or otherwise losslessly frame each field before joining with U+001F,
ensuring embedded newlines and separators cannot truncate values or shift
assignments. Preserve the existing defaults and field order for reactionTTL,
bubbleWidth, bubbleMargin, statuslineWidthAdjust, and statuslineDensity.
- Line 263: Update the PowerShell dimension parsing around _ps_dims so
incomplete output cannot treat the width as _ps_rows; validate that both width
and height are present before accepting the parsed values. When the row count is
missing or invalid, use a conservative fallback that cannot select the
full-density tier, and ensure stale _ps_rows values are cleared before parsing.
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On Windows, jq.exe writes stdout in text mode, which translates the embedded newlines inside a pre-rendered frame string (hat/ears/eyes/ mouth/feet, joined with real characters in the JSON value) into CRLF. Every internal line of a frame except the last then carries a trailing carriage return, which the read loop that splits FRAME_BODY into ART_LINES preserves as a literal ^M at the end of each line. The other jq reads in this file already strip embedded newlines from text fields (name, achievement, reaction) as part of the join-safety fix, so they never see this. FRAME_BODY is the one place newlines in the value are meaningful and must survive -- it just cannot also carry the CR that Windows text-mode I/O adds alongside them. Pipe through tr -d " " the same way the other Windows-specific reads already do. Found by testing after a full reboot: with a legendary/shiny buddy and a real frame (once status.json actually had .frames populated), the hat and ears rows rendered with a visible trailing ^M; the eyes row (the last line of a 3-line compact frame) did not, which is what pointed at CRLF-on-internal-newlines rather than a per-row cause. Signed-off-by: Titus Driessen <tts.driessen@gmail.com>
Three more real issues from CodeRabbit's second review pass:
- `_TIMEOUT_BIN` accepted any binary literally named `timeout`, including
Windows' own native System32 timeout.exe -- a completely different tool
with GNU-incompatible syntax (`/t <seconds>`, and it never runs a trailing
command at all). If PATH resolution ever finds that one instead of Git
Bash's coreutils build, every `_bt`-guarded call silently does nothing
useful: the very first jq read comes back empty, and the script exits
immediately at the empty-NAME guard, rendering nothing. This is plausibly
why the buddy has been invisible in the live terminal even after the
fixes so far landed and were confirmed working in manual testing (which
runs through Git Bash's own PATH, where coreutils timeout resolves first).
Now validates `--version` output looks like GNU coreutils before trusting
a `timeout`/`gtimeout` match; confirmed native timeout.exe's `--version`
fails fast with a usage error rather than hanging, so this check is safe
to run unconditionally.
- The merged PowerShell width+height call assumed the output always has
two lines. If only the width line comes back (a truncated/partial call),
`${_ps_dims#*$'\n'}` with no newline in the string returns it unchanged,
so the width gets read as the row count too -- accepted by
_is_positive_int and able to select the wrong density tier. Now only
trusts the split when the output actually contains a newline; otherwise
clears both values so the existing fallback path handles it as a normal
detection failure, same as it always has.
- The config.json batch (reactionTTL/bubbleWidth/bubbleMargin/
statuslineWidthAdjust/statuslineDensity) had the same embedded-newline/
U+001F truncation risk as the earlier status.json and reaction fixes,
just not yet sanitized. Same `clean` filter, applied after `tostring`
since three of these five fields are ordinarily JSON numbers and jq's
gsub errors on non-string input.
Verified: `bun test statusline/` (20 pass / 13 fail, matching the prior
commit's baseline exactly -- remaining failures are this machine's
own 5000ms-test-timeout-vs-actual-runtime gap, unrelated to these changes),
plus manual checks of the GNU-timeout detection against both the real
coreutils binary and Windows' native timeout.exe, and of the PowerShell
partial-output guard.
Signed-off-by: Titus Driessen <tts.driessen@gmail.com>
Every PR against this repo currently fails "Statusline golden render": the pinned curl=8.5.0-2ubuntu10.11 no longer exists in the Ubuntu 24.04 mirrors, so apt-get install fails at the very first RUN layer, before the build ever reaches anything this PR touches. The comment above this block explains the pins exist so runner image drift cannot silently re-rasterize glyphs during SSIM comparison against the checked-in golden PNGs -- a real concern, but one that only applies to packages that can affect what gets drawn: the font packages themselves, and the Cairo/Pango/GTK stack the headless browser uses to rasterize them. curl, ca-certificates, xz-utils, unzip, jq, python3, ffmpeg, ttyd, findutils, and bash are plain CLI tooling with no rendering path at all; pinning those to exact patch versions only pins the whole build to a specific moment of the Ubuntu mirrors, which is exactly what just broke it. Unpinned those ten packages so apt-get resolves them to whatever noble currently ships; left every font package and every Cairo/Pango/GTK rendering dependency pinned exactly as before, since I cannot verify font-hinting-level pixel effects without actually re-running the VHS capture and SSIM comparison myself. Verified locally: apt-get install with the new (partially unpinned) package list completes cleanly against a fresh ubuntu:24.04 image. Signed-off-by: Titus Driessen <tts.driessen@gmail.com>
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Inline comments:
In `@scripts/ci/Dockerfile.vhs`:
- Line 31: Update the package installation metadata in Dockerfile.vhs to pin
tested Ubuntu Noble versions for both ffmpeg and ttyd, while preserving their
availability for scripts/ci/render-vhs-goldens.sh and leaving the other package
entries unchanged.
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Found while testing on this machine: iconv genuinely is not installed
right now, despite having worked earlier in this same session (only
the libiconv DLL other tools link against is present, not the
standalone binary -- plausibly a Git for Windows auto-update dropped
it, since nothing in this repo touches it).
Without iconv, `dwidth()`/`dwidth_profile()`'s slow path (used for any
non-ASCII content -- rarity stars, mood/achievement glyphs) silently
produced zero width entries for the whole string, and whatever
consumed that width data failed quietly. Concretely: NAME_WITH_LEVEL
for a legendary buddy ("King Viber [L4] ★★★★★") truncated to
"King Viber [L" mid-string, well inside the actual width budget --
not a real truncation, a starved width lookup that made the caller
believe it had already run out of room.
Added a small `_utf8_codepoints` helper both functions now call
through: prefers iconv when present, falls back to python3 (already a
hard dependency of the wider install per README/cli/install.ts)
decoding the same UTF-8 bytes and emitting the same one-decimal-
codepoint-per-token shape `od -An -tu4` does, so the awk scripts that
consume it don't need to know which one ran.
Verified: the legendary-buddy name+level+stars line above renders in
full (confirmed via raw byte dump -- five correctly-encoded U+2605
codepoints, not a truncated fragment) with iconv absent from PATH.
Signed-off-by: Titus Driessen <tts.driessen@gmail.com>
CodeRabbit correctly caught that unpinning these two in the previous commit was wrong: unlike the actual CLI tooling in that same install (curl, jq, python3, ...), ffmpeg and ttyd are VHS's own capture (ttyd) and frame-encoding (ffmpeg) pipeline. A version float there can change encoder defaults or compression behavior and shift pixel values in the rendered output even for byte-identical input -- exactly the class of drift the pins on this file exist to prevent. Restored both to their original exact versions; the other eight packages stay unpinned, since those are genuinely just setup tooling with no path to a rendered pixel. Verified: apt-get install with this exact package list (unpinned tooling + repinned ffmpeg/ttyd + all original font/Cairo/Pango/GTK pins untouched) completes cleanly against a fresh ubuntu:24.04 image. Signed-off-by: Titus Driessen <tts.driessen@gmail.com>
…batch width lookups - Consolidate the three separate config.json jq reads into one call. - Switch that read from `read ... < <(cmd | tr -d '\r')` to `_raw=$(cmd | tr -d '\r'); read ... <<< "$_raw"`: on Windows/MSYS, process substitution was observed to leave a stray trailing CR on the last field even though the pipe's own tr -d '\r' ran cleanly under command substitution, silently breaking statuslineDensity overrides (fell back to auto instead of matching the case pattern). - Batch the per-string python3/awk subprocess pairs in dwidth()/ dwidth_profile() into far fewer combined calls (join multiple strings with the existing \x1f delimiter, one decode+width pass instead of one per string), cutting Windows subprocess spawn overhead further. - Derive NAME_LINE_W arithmetically from LABEL_W + NAME_PAD instead of a redundant dwidth() call, since NAME_LINE is always NAME_PAD ascii spaces prepended to the already-measured label. - Break up the long uninterrupted run of literal spaces in the no-bubble placeholder row branch with a no-op ANSI reset, matching the shorter space run every bubble-paired row already has before its color code. VS Code's terminal was observed shifting that row's content left, even though the script's own captured stdout was byte-correct. Net effect on Windows: statusline runtime ~3.9-4.0s -> ~2.2-2.5s, and combined with a refreshInterval bump (separate settings.json change, not part of this repo), the companion now reliably renders instead of every tick racing its own cancellation. Verified behavior-identical (byte-for-byte, pinned BUDDY_FAKE_NOW) against the pre-change script across 9+ scenarios: full/compact/minimal density tiers, the CI golden-render widths (60/80/120 cols), with/without config.json, with/without an active reaction bubble, an achievement banner with wide emoji, and common vs legendary/shiny buddies. Signed-off-by: Titus Driessen <tts.driessen@gmail.com>
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Inline comments:
In `@statusline/buddy-status.sh`:
- Line 136: Update the rainbowColors transformation in the configuration
pipeline to validate that the value is an array before applying `@tsv`; return an
empty value for non-array palettes while preserving the existing formatting for
valid arrays and default handling.
- Line 1137: Update statusline_output_line to safely default its optional second
argument when omitted, then compute or reuse the width profile before calling
ansi_truncate. Preserve explicitly supplied profiles and ensure callers without
$2 remain within STATUSLINE_BUDGET under set -u.
- Around line 1084-1086: Refactor the _strip_ansi calls in the OUTPUT_LINES
strip pass and the statusline_output_line fallback to return results through its
established global/output variable instead of command substitution, eliminating
one subshell fork per rendered row while preserving the current stripped text.
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…file is passed statusline_output_line/ansi_truncate now accept an optional precomputed width-profile string for the main render loop's batched width lookups, but substatus.sh's append_substatus calls statusline_output_line with only the line itself. Without a profile, every character was silently treated as width 1, so wide characters (emoji, Powerline separators) in a cached sub-status line broke the width budget instead of being accounted for. Fall back to computing the profile in ansi_truncate itself (dwidth_profile on the ANSI-stripped text) when no widths_str is given, restoring the original self-sufficient behavior for callers outside the main loop. Caught by CI: "truncates cached sub-status rows to the adjusted budget". Signed-off-by: Titus Driessen <tts.driessen@gmail.com>
…subshell per row - rainbowColors // [] | @TSV errors out when rainbowColors is present but not an array (e.g. a string), which emptied the whole consolidated config read and silently reset every other config field to its default too. Guard with a type check so only rainbowColors itself falls back. - _strip_ansi now returns through a global (_STRIP_ANSI_OUT) instead of printf + command substitution, removing one subshell fork per rendered row -- the same class of per-call spawn cost this PR removes elsewhere. Both addressed from CodeRabbit review on PR ramarivera#177. Signed-off-by: Titus Driessen <tts.driessen@gmail.com>
…us.sh on Windows
- statusline_output_line now emits \033[2K before each row. Observed live in
VS Code: when a row's internal structure changes a lot between ticks
(a reaction bubble appearing/disappearing, or combined-status.sh's
rate-limit stats appearing) while total visible width stays the same,
stale characters from the previous tick's differently-shaped line could
linger instead of being fully overwritten. Erasing the line first makes
every tick draw onto a blank line regardless of what tick came before.
- combined-status.sh (rate-limit bars alongside the buddy, enabled via
/buddy statusline combined) was non-functional on Windows and has three
fixes:
- Its row-injection check only recognized the Braille Blank leading pad
character, which buddy-status.sh never uses on Windows/MSYS (plain
spaces there, since Braille Blank renders double-width) -- so the bars
silently never merged in. Now accepts either and echoes back whichever
was actually there.
- Its merge step printed the buddy's raw text straight through, and
python3's stdout falls back to the system ANSI codepage instead of
UTF-8 when piped (not a real console) -- cp1252 on Windows -- crashing
on the first non-Latin character (e.g. the rarity stars). Fixed with
PYTHONIOENCODING=utf-8.
- Same python3-on-Windows text-mode \r\n corruption already fixed
elsewhere in buddy-status.sh; stripped here too.
- Also: the has_data round-trip through a second python3 call just to
read back a field the first call already computed is now a plain
string match instead, and a missing space between the countdown arrow
and the reset time (`↻4h17m` -> `↻ 4h17m`) is fixed.
- The erase-line prefix from the change above is stripped and
reattached around the injection logic so row detection still works.
Verified: full test suite (known Windows-timing flakiness aside, no new
failures), manual pipeline checks for both the no-data passthrough and
with-data merge paths, and confirmed live in two real VS Code windows with
combined mode enabled -- correct and stable across ticks, including through
reaction-bubble and rate-limit-data transitions.
Signed-off-by: Titus Driessen <tts.driessen@gmail.com>
…R "m" stripAnsi()/SGR_TOKEN_RE only matched \x1b[...m (color codes), so the new \x1b[2K erase-line prefix statusline_output_line emits before every row (previous commit) was counted as visible characters by displayWidth(), inflating measured width past budget. Caught by upstream CI. Broaden both to match any CSI sequence (ESC [ params final-letter), which covers SGR, erase-line, cursor movement, and any other standard code with the same shape. Signed-off-by: Titus Driessen <tts.driessen@gmail.com>
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Summary
On Windows,
statusline/buddy-status.shcan take 23-29s to run under a real invocation (COLUMNSunset, matching how the host actually spawns it). That's long enough to regularly exceed whatever timeout the host enforces on arefreshInterval: 1statusline command -- the script never finishes, so the display just freezes on stale content indefinitely. It looks like a random rendering glitch, but it's a timeout, and it lines up with the existing entries indocs/statusline-performance-complaints.mdabout the statusline regressing past the host's kill threshold.bun test statusline/against the unmodified script on the Windows machine I tested this on scores 1 pass / 32 fail (mostly 5000ms test timeouts). This change gets that to 15 pass / 18 fail, with wall-clock runtime down to ~7.5-8s -- roughly a 3.5x improvement. No behavior change is intended for any value the script produces, only how many processes get spawned to compute them.Root causes (in order of impact)
dwidth()spawnediconv | od | awk(three processes) per call, and word-wrap calls it once per word in the reaction text. Every ASCII codepoint is width 1 underchar_width()'s own logic (none of the wide/CJK/fullwidth/box-drawing ranges overlap 0-127), so ASCII-only input -- the common case for reaction text -- can skip straight to${#1}. Added the same fast path todwidth_profile(), whichansi_truncate()calls once per output line.jqcalls (9 againststatus.json, 5 againstconfig.json, 2 against the reaction file), each costing ~100-400ms on the machine I tested this on (process-spawn cost on Windows can be unusually high, plausibly antivirus real-time scanning, but the fix helps regardless of the underlying cause). Batched each group into onejqcall emitting a joined array, split back out withIFS=$'\x1f' read -r.powershell.execalls (width, then height) -- each a full PowerShell host boot, measured at ~0.5-1s alone -- collapsed into one call that queries both./proc+ps-based PTY-walk loop is Linux/macOS-only: there's no/procand no real tty devices on Windows, so it ran all 5 iterations and failed every single time, burning real time on a probe that could never succeed there. Skipped outright on Windows via auname -scheck.Test plan
bash -n statusline/buddy-status.sh(syntax)bun test statusline/-- baseline (unmodified) scores 1 pass / 32 fail on the Windows machine I tested this on; this branch scores 15 pass / 18 fail (remaining failures are the same 5000ms-timeout class, just less frequent -- this machine's absolute per-process cost is still high even after the fix)Test (Bun latest); the only failing check there (Statusline golden render) is an unrelated pre-existing Docker build break (apt-get installfails on a pinnedcurlversion no longer in the Ubuntu 24.04 mirrors) -- not something this change touches.Summary by CodeRabbit
Bug Fixes
Performance